i am not sure what elevation your at or what temps you ride in, but their #'s seem pretty good. with a slip on and K&N, we run a 152 keihin main in the summer and a 155 in the winter with the airbox lid on. these jets seem to be really close. i would use a 42 pilot or so. airskrew out around 2.5 to 3 turns. for the needle, i would leave it stock in the summer but in the winter my bike seemed to run smoother when it was cold with the clip on the 4th position (one down from stock). good luck
2005 450r
*sold* 2001 400ex
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